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Diagnosis Help?

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Old Aug 30, 2002 | 09:13 AM
  #1  
How You Doing's Avatar
How You Doing
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Default Diagnosis Help?

My Automatic Corvette has been running unusual and I wanted to know if anyone could help figure out what is wrong?

When I have it in Drive and I am sitting at a stop light with the AC or heat on, it idles oddly - it almost feels like it is jumping in and out of neutral.

When I shift it to neutral it seens to run fine or if I just don't turn on the AC or heat it runs fine.

Any Ideas at all??? :confused:
Thank you for your time.
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Old Aug 30, 2002 | 09:47 AM
  #2  
DarkHalo's Avatar
DarkHalo
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From: SCMR Rat Pack'r Charter Member, Inland Empire Chapter
Default Re: Diagnosis Help? (How You Doing)

What are the RPMs on it with the AC on and off? It almost sounds like the idle isnt being raised when the AC is turned on like its supposed to.
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Old Aug 30, 2002 | 09:47 AM
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vettmech
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From: Charleston, WV
Default Re: Diagnosis Help? (How You Doing)

could be the a/c compressor cycling .........some vehicles cycle the IAC to compensate for this ........maybe yours isn't or doesn't :seeya
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Old Aug 30, 2002 | 11:09 AM
  #4  
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Default Re: Diagnosis Help? (DarkHalo)

Thanks for your response.

The RPMs are around 700 then Jump up to around 1400.
And it feels like the Transmission is trying to shift into and out of gear.

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Old Aug 30, 2002 | 11:21 AM
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hotwilzz
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Default Re: Diagnosis Help? (How You Doing)

Depending on the year and motor in your car, if it has an L98, I just had a similar issue with my 89 6 speed and it turned out to be the Idle Air control valve. Good as new after replacing it

good luck
david
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Old Aug 30, 2002 | 11:40 AM
  #6  
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vettmech
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From: Charleston, WV
Default Re: Diagnosis Help? (hotwilzz)

I agree .......if it's revving up THAT much .........I'd go for the IAC valve too :seeya
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